Are all american trucks using unsynchronized gearboxes

I have driven three trucks with the sync transmissions. One was a Daf, Daewoo, and Isuzu. They range from two ton truck to a class eight. I personally don't like them in big trucks. For me if I have a load behind them I can't get the right gear fast enough. All three mentioned above were cabovers. Two of them had cable operated shifting transmissions. It might also be that my boots are too wide for them and I keep hitting the brake and the gas at the same time.

I prefer the unsync trans because it is one less thing that you have to press while driving. I have only been driving for 2 months, but I have driven trucks with just about every single type of transmissions. Eaton Fuller AutoShift, Ultrashift, Allison automatic, ZF trans, 18 speed, 10 speed, 6 speed, and a 9 speed. I like the ten and 18 speed best.

 

LOL, not bad english at all.

 

WOW!!! you have sure packed a lot of driving into your 2 months and amazingly you don't seem to have driven with the most common 13 spd ?

 

I don't know of a heavy duty trans that is fully syncronized currently being used here. Even the automated transmissions (auto-shift, ultra-shift, I-shift, and Freedom) are non-syncronized internally. The Allison is a hydraulically controlled trans, like in a passenger car.

 

he works for cummins testing all there high tech top secret stuff! lol if he told ya, he'd have to kill ya!

 

Thats why I can't tell ya. Don't want to deal with the mess.

It wasn't until about 8 months ago that I got to drive a 13 speed. Took a little getting use to to put the secondary splitter into the rearward position when going into low range.

There is a new one I have not driven yet and that I have just heard about two days ago. It is a dyna automated transmission. Don't know how it works.

I will tell you that the one that I have the most fun in is a truck with an allison in it. If the ground is a little wet and you don't have a trailer it is rather easy to spin the rear tires.

 

Yes, American trucks use "crash boxes". After you learn the ins and outs of how use one, you can forgo the clutch except to start and stop, unlike the synchro shifters.

Besides, synchros are wear items that don't last forever, enough shifting and they can wear out, and the only way to fix it is tear apart the whole trans. I remember this when I drove the eaton synchro 6 on class7 rigs. 1st gear and reverse gear synchros would always wear out first, and you get a familiar grinding noise when going into gear that you can't avoid beacause there is no clutch brake.

I have heard some Europeans nearly have a heart attack and accuse us of being "in the stone age" because we still use crash boxes here in America. As you can see, there is a method to this maddness!!!

 

being a local driver, meaning that i have to shift up through the gears just to go back down a few miles later, Im really glad i dont have to press that clutch in everytime i have to shift... although i will double clutch if i need to get used to a different truck.

my pickup only has 175k on it, and even though it isn't built quite as heavy, it isn't nearly as smooth to shift, and its previous owners wore it out so much already i do my own sort of double clutching on it (won't float a synchro tranny, even people that can float gears no problem cause tranny problems in the lighter stuff cause they think it applies)

my 61 falcon's 3 speed has a non-synchro 1st, i can drive it just fine, without any grinding either...

when you think about how much of the general public can't even drive a four wheelers gearbox, floating gears adds a certain amount of pride, mostly when you first learn.

 

is it impossible to float in syncrogearbox?

 

I used to float my 5 speed Ford Explorer. I dunno if that's at all the same as what's been talked about here, though.